人民黄河2018，Vol.40Issue(5)：73-77,5.DOI:10.3969/j.issn.1000-1379.2018.05.016
阻力线性化条件下纵向离散系数的半解析解法
Semi-Analytical Solution to Longitudinal Dispersion Coefficient Under Linear Resistance Condition
摘要
Abstract
The longitudinal dispersion coefficient is a key parameter in water quality model,which has a great influence to the influence area of pollutant.Thus,it has been a research focus in environmental hydraulics.At present,approaches to determine longitudinal dispersion coef-ficient(DL)are mainly based on empirical or semi-empirical formulas without definite physical mechanism. Based on assumption that the bottom resistance was linear with velocity,a power series form for velocity distribution was acquired. By adopting Fischer's integral formula, a semi-analytical method to compute DLwas established and generalized to natural rivers. The applications in more than 100 rivers show that the computed value of DLis about 0.3 to 3 times of the measured value,meeting the requirements of the project. With acceptable accuracy, low computational complexity,the method reflects the dispersion physical mechanism to some extent. Moreover, this formula has the same magnitude error with previous formulas and it means the formula has certain reliability.关键词
纵向离散系数/阻力线性化/幂级数/流速分布/半解析解/环境水力学Key words
longitudinal dispersion coefficient/resistance linearization/power series/velocity distribution/semi-analytical solution/envi-ronmental hydraulics分类
建筑与水利引用本文复制引用
张文俊,胡煜,任华堂,夏建新..阻力线性化条件下纵向离散系数的半解析解法[J].人民黄河,2018,40(5):73-77,5.基金项目
国家自然科学基金资助项目(51479218). （51479218）
